Drying front in a sloping aquifier: nonlinear effects
Data(s) |
01/01/2004
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Resumo |
The profiles for the water table height h(x, t) in a shallow sloping aquifer are reexamined with a solution of the nonlinear Boussinesq equation. We demonstrate that the previous anomaly first reported by Brutsaert [1994] that the point at which the water table h first becomes zero at x = L at time t = t c remains fixed at this point for all times t > t c is actually a result of the linearization of the Boussinesq equation and not, as previously suggested [ Brutsaert, 1994 ; Verhoest and Troch, 2000 ], a result of the Dupuit assumption. Rather, by examination of the nonlinear Boussinesq equation the drying front, i.e., the point x f at which h is zero for times t ≥ t c , actually recedes downslope as physically expected. This points out that the linear Boussinesq equation should be used carefully when a zero depth is obtained as the concept of an “average” depth loses meaning at that time.<br /> |
Identificador | |
Idioma(s) |
eng |
Publicador |
American Geophysical Union |
Relação |
http://dro.deakin.edu.au/eserv/DU:30002714/stagnitti-dryingfront-2004.pdf http://dx.doi.org/10.1029/2003WR002255 |
Direitos |
2004, American Geophysical Union |
Palavras-Chave | #hydrology #groundwater hydrology #groundwater transport |
Tipo |
Journal Article |